88 Annals Entomological Society of America  [Vol. VII, 
several hundred were easily collected for experimental work. 
They were taken for the most part on the foliage of trees and 
attached to dead caterpillars. 
The Calosoma beetle (Calosoma sycophanta) has coon 
observed in large numbers in towns where bad colonies of the 
gipsy moth were present. It has not been possible to obtain 
definite records of the amount of benefit derived from this 
species or of its abundance, except in cases where trees were 
burlapped, as these bands furnish favorable hiding places for 
the caterpillars and are favorite locations for the beetles and 
larve to obtain food. In such cases, where caterpillars were 
abundant, twenty or more of the Calosoma larve have fre- 
quently been found under a single burlap band on an average 
sized tree. As they feed upon the pupz as well as upon the 
caterpillars, the amount of benefit derived is very great, 
although it is difficult to figure the percentage of larve killed. 
From collections made during the winter of 1912-13 it 
was determined that Monodontomerus aereus has spread over 
practically the entire territory now known to be infested by 
the brown-tail moth. It was not found in as large numbers as 
during the previous year. Pteromalus egregius has been found 
widely scattered over the area infested by the brown-tail 
moth, and its numbers are slowly increasing, judging from the 
records that have been secured from sample collections. 
There is thus no doubt that a number of the imported 
species are thoroughly established and that they are increasing 
each year, and further that many hundreds of thousands of 
caterpillars were killed by them during the past summer. 
